Hydraulic jack reservoir



1380- 1956 F. J. JAKOUBEK HYDRAULIC JACK RESERVOIR jzazs/zfgr 52/2/31ffz/iowei.

Filed Nov. 19, 1953 United States Patent HYDRAULIC JACK RESERVOIR FrankJ. Jakoubek, Elmwood Park, 11]., assignor to Star 1 Jack Company, Inc.,River Grove, 111., a corporation 'of Illinois Application November 19,1953, Serial No. 393,144

11 Claims. (Cl. 137-587) The invention relates generally to improvementsin hydraulic jacks, but relates more particularly to means for bafilngthe oil returning to the oil reservoir in hyculty has been encountered,in that part of the oil would become admixed with the air, forming anaerosol, part of which would spray out through the vent or reliefopening. The object of the present invention is to provide means whichwill prevent the atomization of the oil on its return to the oilreservoir and its passage out the vent opening. Another object of'theinvention is to provide simple, inexpensive and efficient means forbafiiing the oil on its return to the oil reservoir.

A still further object of the invention is to provide bafile means whichmay be readily assembled with the remaining parts of the jack and which,when assembled, will automatically maintain the position in which it isplaced without the necessity of extraneous fastening means.

The above mentioned objects of the invention, as well as others, alongwith the advantages thereof, will more fully appear as the specificationproceeds.

In the drawings:

Fig. 1 is a vertical sectional view through a jack embodying theinvention.

Fig. 2 is ,a transverse sectional view on the line 2-2 of Fig. 1, viewedin the direction of the arrows.

Fig. 3 is a fragmentary detail view on the line 3--3 of Fig. I, viewedin the direction of the arrows, and

Figs. 4 and 5 are fragmentary sectional views showing modified forms ofthe invention.

In the drawings represents the base of the jack, in which the variousvalve mechanisms are located. There is no particular novelty in thevalve mechanisms and in the pump, so that they have been illustrated inrather schematic form and will be described only briefly.

An oil reservoir tube 11 is fitted at 12 to the pump base, the upper endbeing closed by a cap 13. An inside cylinder 14 is provided, one end ofwhich is threaded into the base at 15 and into the cap 13 at 16. Withinthe cylinder 14 is a ram member 17 which projects through the cap 13,being suitably sealed against oil leakage by means of the O ring 19. Atthe lower end, the ram carries a ram cup support washer 20 and a ram cup21.

In the base of the jack there is provided a pump piston 22 which isshown in its inner position and which, byjneans of a lever 23, may bereciprocated in order to force oil under pressure into the cylinder 14under the 2 ram cup 21, thereby to force the ram upwardly. The piston isactuated by means of the lever 23.

24 as a whole represents the intake valve assembly, which comprisesballs 25 and 26 that are pressed against seats 27 and 28 respectively bysprings 29 and 30 respectively, the whole assembly being held in placeby the screw plug 31. 32 as a whole represents a release valve assemblywhich includes a ball 33 pressed against a seat 34 by means of a spring35, the assembly being held in place by the screw plug 36. A plunger 37is'slidably mounted in the sleeve 38. The plunger 37 may be movedinwardly to press the ball away from its seat by means of the lever 39which is pivoted at 40 on a bracket 41 carried by the base of the jack.

The space between the cylinders 11 and 14 provides a reservoir for thehydraulic fluid which, when the ram is in its lowermost position, is ata level just below the filler screw plug 42. At a level above the fillerplug 42 there is provided a vent plug 43. The plug 43 remains inposition at all times, but is cut away or flattened on one side at 44 toprovide a vent opening to atmosphere.

In the oil reservoir space there is provided an oil bafile 45, which asillustrated, takes the form of a spiral spring, the lower convolution 46being of a diameter approximating the inside diameter of the outer tube11 and finding its support upon the upper part of the base 10. The upperconvolution 47 is of a size slightly less than that of the externaldiameter of the cylinder 14 so as snugly to grip the surface of the tube14. Thus when the battle member 45 is placed in position a slightfrictional gripping action of the upper convolution on the outer surfaceof the cylinder 14 serves to hold the bafile in position against theaction of oil movement, when discharging back into the reservoir uponthe release of the release valve. The bafile 45 (Fig. 4) is like bafile45 except that it is inverted and resiliently engages the walls of boththe inner and outer tubular members. The Fig. 5 bafile, 45 is in theform of an inverted V resting on the base and resiliently engaging wallsof both the'inner and outer tubular members.

Operation of the jack It will be understood that as the piston 22 movesfrom its inner position to its outer position under the action of thelever 23, the suction will move the ball 25 away from its seat, thuscausing oil to flow through the conduit 48 into the bore 49 and thenceby conduit 50 into the space 51 at the end of the piston 22. When thepiston is moved in the direction of the arrow indicated inFig. 1, theoil previously withdrawn from the reservoir will be forced underpressure back through the conduit 50 and thence by means of conduits 52and 53 into the space under the member 21 of the hydraulic ram 17,thereby forcing the ram away from the base. It will, of course, heunderstood that the pressure stroke of the piston 22 will move ball 26away from its seat, thereby communicating conduits 50, 52 and 53.Reciprocatory action of the pump piston will be continued until the ramhas been elevated or projected the desired extent. Of course, as oilflows into the space under the ram, the level of oil in the reservoirwill drop until when the ram has reached its maximum outward extent, atwhich time there will be very little oil remaining in the reservoir.Obviously as the oil level drops in the reservoir atmospheric air willflow through the vent opening 44 into the reservoir space until theexternal and internal air pressures are equalized. Since considerablepressure is required to raise the ram, it will be understood that theoil which is locked in place under the ram will be under high pressure.

In order to permit the ram to return to its lower position it isnecessary to operate the release valve 32. This is done by causing thelever 39 to swing in the direction of the arrow which then moves theplunger 37 inwardly, thereby removing the ball from its seat '34,whereupon the oil under high pressure flows back through the conduit 53,past the seat 34 into the conduit 54 in .the plunger 37 and thence backinto the reservoir by means of the conduit 55. Since the oil dischargingfrom the top of the conduit 55 is under high pressure and is discharginginto the reservoir space which contains a considerable amount of airunder atmospheric pressure, the rapid expansion of the oil tends to forma mist or aerosol, a part of which would pass: out through the ventopening 44 unless restrained. With the present construction, however,the oil spray discharging from the conduit 55 encounters a series ofconvolutions of the bafile 45, 45 or 45 as the case may be, which baifleacts etfectively to disperse the oil and prevent the formation of anaerosol admixture. In this way the oil is enabled to flow .back into thereservoir space, displacing the air as the oil level rises and causingthe displaced air to flow quietly out through the opening 44 without, atthe same time, causing any substantial amount of oil spray or vapor tobe discharged from the reservoir.

While the invention is extremely simple, it has been found effective toovercome the objectionable aerosol spray discharge action heretoforefound in hydraulic jacks of this type. The bafiie is also low in costand can be assembled quickly and easily.

I claim:

1. Means for preventing the discharge of hydraulic fluid through the airvent opening leading to external atmosphere from one .end of the annularhydraulic jack reservoir space formed between spaced inner and outertubular members as a .result of hydraulic fluid charging into saidannular space under pressure through an opening located at the endopposite said air vent, said means comprising a plurality ofconvolutions of different sizes positioned in the space between theouter wall of the inner tubular member and the inner wall of the outertubular member, and between the air vent and the hydraulic .fluidopening.

2. The combination set forth in claim 1 in which one of the convolutionsof the bafiie means frictionally engages, at least in part, a wallsurface of one of .said tubular members for holding the bafile meansagainst movement in at least one direction.

3. The combination set vforth in claim .1 in which one of theconvolutions of the battle means is seated, at least in part, upon afixed part of the jack reservoir.

4. The combination set forth in claim .1 in which one of theconvolutions of the 'bafiiemeans is seated, at least in part, upon thebase portion :of the jack reservoir.

5. Means for preventing the discharge of hydraulic fluid through the airvent opening leading to external atmosphere from one end of the annularhydraulic jack reservoir space formed between spaced inner and outertubular members as a result of hydraulic fluid charging into saidannular space under pressure through an opening located at the endopposite said air vent, said means comprising a tapering coil in thespace between the outer wall of the inner tubular member and the innerwall of the outer tubular member, and between the air vent and thehydraulic fluid opening.

6. The combination set forth in claim 5 in which the coil is a springcoil and in which one of the convolutions thereof resiliently engages,at least in part, one of the wall surfaces of the inner or outer tubularmembers.

7. The combination. set .forth in :claim 5 in which the coil is a springcoil and in which a plurality of convolutions thereof resilientlyengage, at least in part, portions of the walls of the inner and outertubular members.

8. The combination set forth in claim 5 in which a part of the coilmember is seated upon a fixed part of the jack reservoir structure.

9. Means for preventing the discharge of hydraulic fluid through the airvent opening leading to external atmosp'here from one end of the annularhydraulic jack reservoir spaced formed between spaced inner and outertubular members as a result of hydraulic fluid charging into saidannular space under pressure through an opening. located at the endopposite said air vent, said means comprising a tapering spiral coilmember in the space between the outer wall of the inner tubular memberand .the inner wall of the outer tubular member and between the air ventand the hydraulic fluid opening, one end being seated upon the baseportion of the jack reservoir and the other end frictionally engaging,at least in part, a wall portion of one of said tubular members.

10. The combination set forth in claim 9 wherein the largest dimensionof the coil is seated'upon a fixed part of the jack reservoir.

l1.v The combination set forth in claim 9 in which the coil is a springcoil wherein the largestdimension is seated upon a fixed part of thejack reservoir and the smallest dimension resiliently embraces, at leastin part, the outer surface of the smaller tubular member.

References Cited in the file of this patent UNITED STATES .PATENTS1,364,865 Capell Jan. 11, 1921 1,455,224 Paoli May 15, 1923 1,611,703Zabriskie Dec. 21, 1926 1,715,901 Countryman June 4, 1929 1,920,285Wilkins et a1. Aug. 1, 1933

